EP 0786043 A1 19970730 - SOLENOID GUIDE SYSTEM FOR HORIZONTAL BOREHOLES
Title (en)
SOLENOID GUIDE SYSTEM FOR HORIZONTAL BOREHOLES
Title (de)
ELEKTROMAGNETISCHES FÜHRUNGSSYSTEM FÜR HORIZONTALE BOHRLÖCHER
Title (fr)
SYSTEME DE GUIDAGE A SOLENOIDE POUR TROUS DE FORAGE HORIZONTAUX
Publication
Application
Priority
- US 9513477 W 19951107
- US 33718894 A 19941107
Abstract (en)
[origin: US5513710A] A method and apparatus for drilling a borehole under an obstacle including placing a solenoid on the surface of the earth at the far side of the obstacle, near a preselected borehole exit location. A drilling assembly at an entry location on the near side of the obstacle is driven to produce a borehole which is directed under the obstacle toward the exit location. Initially, guidance of the drilling assembly is by conventional survey techniques, but when the borehole moves to within about 100 meters of the solenoid, the solenoid magnetic field is used to guide the drilling operation.
IPC 1-7
IPC 8 full level
E21B 7/04 (2006.01); E21B 47/022 (2012.01)
CPC (source: EP US)
E21B 7/04 (2013.01 - EP US); E21B 47/0232 (2020.05 - EP US)
Citation (search report)
See references of WO 9614491A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
US 5513710 A 19960507; CA 2202460 A1 19960517; EP 0786043 A1 19970730; WO 9614491 A1 19960517
DOCDB simple family (application)
US 33718894 A 19941107; CA 2202460 A 19951107; EP 95939544 A 19951107; US 9513477 W 19951107